About Optics & Photonics TopicsOSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. This topic browser contains over 2400 terms and is organized in a three-level hierarchy. Read more.

Topics can be refined further in the search results. The Topic facet will reveal the high-level topics associated with the articles returned in the search results.

Abstract

A primary-level comparator, with a reproducibility of 0.2 nm and
intended for realization of a Systeme International length unit in the
range of 1–100 mm, is reported. High-precision differential
measurements of phase change on reflection from blocks and end plates
are demonstrated. A set of experiments has been developed to
measure systematic error associated with nonideal interferometer optics
and deviations from flatness of an auxiliary plate. For specially
selected high-grade 6-mm blocks, reproducible wringing has been
achieved with a random uncertainty in length measurements of 0.1–0.2
nm. Subnanometer wear-off of the blocks as a result of the cleaning
has been detected. Under the conditions of reproducible wringing,
the accuracy of the length measurements is evaluated to be in the
2–3-nm range for 6-mm blocks.

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.